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References in periodicals archive ?
Henri Becquerel (1852-1908) was born into a remarkable academic family in Paris, both his grandfather Antoine Cesar Becquerel (1788-1878) and father Edmond Becquerel (1820-1891) having been Professors of physics who, respectively, did research on electricity and the solar spectrum.
In February 1896 Becquerel wrapped photographic film in black paper and put it in sunlight with a crystal of potassium uranyl sulfate upon it.
Seiji Kanno, a farmer, said that 99.9 per cent of the rice produced in Fukushima is under 25 becquerel, while the radioactive element in 95 percent is contained.
Sadly he had no idea just how dangerous his new discovery was: The first safe exposure limits only came in to force 30 years later and by then it was too late for Becquerel and his fellow workers.
One of those who followed up instantly on Becquerel's discovery of the radiation from potassium uranyl sulfate (see 1896) was a Polish-born French chemist, Marie Sklodowska Curie (1867-1934).
Ever since the days of WilhelmRoentgen and Henri Becquerel, just before the turn of the century, people have been using X-rays to find out about the insides of opaque solid objects.
has said that radioactive cesium levels found in some dried tobacco leaves harvested in Fukushima Prefecture this year exceeded the company's limit of 100 Becquerel per kilogram.
There were also no major differences in the radioactivity level between production areas, with the average radioactivity surface concentration of the products in Fukushima marking 0.009 becquerel per square centimeter, that in Tokyo and western Japan 0.026 becquerel per square cm and that in Asia and Europe marking 0.013 becquerel per square cm.
The highest values were observed in the prefecture of Fukushima with 23 000 becquerel per square metre for iodine-131 and 790 becquerel per square metre for caesium-137.
In 1903, they received the Nobel Prize for Physics with Becquerel for the discovery of radioactivity.